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NPTEL Software Testing Assignment 6 Answers
Q1. While applying logic-based testing to test source code, is it true that the predicates can be taken exactly as they occur in code always?
a. Yes, the predicates can be considered exactly as they occur in code.
b. No, some times we have to add extra clauses to the predicate
Answer: b. No, some times we have to add extra clauses to the predicate
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Q2. How do logical predicates occur in finite state machines?
a. The logical predicates occur as a part of the states of the finite state machines.
b. The logical predicates occur as guards in the transitions of the finite state machines.
Answer: b. The logical predicates occur as guards in the transitions of the finite state machines.
Q3. In a requirements specification document, where do logical predicates occur?
a. They occur directly as a part of the requirements.
b. They occur as pre-conditions, invariants and post-conditions in the requirements.
c. All the conditions in requirements can be translated into predicates.
d. Logical predicates cannot be found in requirements.
Answer: b. They occur as pre-conditions, invariants and post-conditions in the requirements.
Answer the following questions for the method twoPred() below.
The method is called with two input parameters x and y.
public String twoPred (int x, int y)
{
boolean z;
if (x < y)
z = true;
else
z = false;
if (z && x+y == 10)
return z;
else
return z-1;
}Q4. State true or false: The internal variable z in the second predicate needs to be re-written in terms of the input parameters x and y.
A. True
B. False
Answer: A. True
Q5. Is it true that predicate coverage for the first predicate will also subsume predicate coverage for the second predicate?
A. True
B. False
Answer: B. False
Q6. How many test cases will be needed for clause coverage for the second predicate if we explicitly count the true and false values for each clause?
a. Two test cases.
b. Four test cases
Answer: b. Four test cases
Q7. State true or false: The set of test case inputs {(x=5,y=3),(x=4,y=6),(x=5,y=6)}{(x=5,y=3),(x=4,y=6),(x=5,y=6)} will satisfy clause coverage for the second predicate.
a. True
b. False
Answer: a. True
Q8. State yes or no: The set of test case inputs {(x=5,y=3),(x=4,y=6),(x=5,y=6)}
a. Yes
b. No
Answer: a. Yes
Q9. How many test cases are needed for satisfying RACC for all the clauses for the second predicate?
a. Only one test case
b. Two test cases
c. Three test cases
d. Five test cases
Answer: c. Three test cases
Q10. State true or false: The set of test case inputs {(x=4,y=6),(x=6,y=4),(x=4,y=5)}{(x=4,y=6),(x=6,y=4),(x=4,y=5)} satisfy RACC for the second predicate.
a. True
b. False
Answer: a. True
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